EP1891340A1 - Vis à utiliser dans le béton - Google Patents

Vis à utiliser dans le béton

Info

Publication number
EP1891340A1
EP1891340A1 EP06741570A EP06741570A EP1891340A1 EP 1891340 A1 EP1891340 A1 EP 1891340A1 EP 06741570 A EP06741570 A EP 06741570A EP 06741570 A EP06741570 A EP 06741570A EP 1891340 A1 EP1891340 A1 EP 1891340A1
Authority
EP
European Patent Office
Prior art keywords
screw
grooves
shank
threads
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06741570A
Other languages
German (de)
English (en)
Inventor
Uli Walther
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WALTHER, GERDA
WALTHER, MIRCO
WALTHER, ULI
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CA002510200A external-priority patent/CA2510200A1/fr
Application filed by Individual filed Critical Individual
Publication of EP1891340A1 publication Critical patent/EP1891340A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0052—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge having indentations, notches or the like in order to improve the cutting behaviour
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0073—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw characterised by its pitch, e.g. a varying pitch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts
    • F16B35/048—Specially-shaped necks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/30—Locking exclusively by special shape of the screw-thread

Definitions

  • the present invention relates generally to a screw fastener, which is adapted to be secured in a hole drilled in a masonry structure such as concrete but it may be used in other masonry materials such as brick or ceramic
  • the screw is of a type, sometimes called Hi-Lo, having a major thread of a major crest diameter, and an intermediate minor thread of minor crest diameter
  • Concrete screws namely screws adapted for use in a concrete or other masonry substrate, typically are screwed, either by hand or power tools, into an appropriately sized bore hole in which the diameter of the bore hole is slightly greater than the diameter of the shank of the screw, while the crest diameter of the threads of the screw exceed the diameter of the bore hole
  • the present screw provides a Hi-Lo structure, with a counter rotational groove to absorb cuttings from the borehole and reduce frictional resistance while inserting the screw
  • the screw has a set of major and minor co-helical threads of a pitch generally at least equal to the shank diameter
  • the screw embodies one or more counter-helical V-shaped grooves extending through the full height of the major and minor threads and into the shank of the screw
  • the counter-rotational helical grooves are of a very coarse pitch, typically about two to six times the opposite pitch of the threads, preferably about five times
  • the screws also have secondary partial length grooves intermediate the V-shaped grooves
  • Fig 1 is a side view of a concrete screw according to the present invention
  • Fig 2 is a cross-sectional view taken along the lines Il - Il of Fig 1 showing a single convolute of major and minor threads and the counter-rotational grooves,
  • Fig 3 is a sectional view taken along section line III - III of Fig 1 , and showing the geometry of the asymmetrical W-shaped cut-outs in the tip portion of the screw in a further embodiment of the invention
  • Fig 4 is a side view of another embodiment of the screw according to the present invention.
  • Fig 5 is a side view of an enlarged view of the tip portion of the screw of Fig 4
  • Fig 6 is a cross-sectional view taken along the lines Vl-Vl of Fig 5 showing two sets of grooves
  • Fig 1 an exemplary type of concrete screw incorporating the present invention
  • the screw is integrally formed, preferably of nickel, and comprises a shank portion 10, having at one end a tip 11
  • the opposite, second end of the shank portion 10 has a head end portion 12, which is unthreaded
  • the head end portion 12 has a somewhat increased diameter to provide a smooth transition to a head 13, for instance, by a frustoconical transitional section 14
  • the enlarged transitional section also enables reception of a larger or a more powerful screw driving means
  • the shank 10 has multiple convolutions of at least two helical threads
  • a first thread 15 has a crest diameter (the diameter of the virtual cylinder enclosing the outer periphery of the threads) greater than the shank diameter
  • crest diameter of major thread 15 exceeds the shank diameter from about 20 to 30 percent
  • minor helical thread 16 The crest diameter of minor helical thread 16 exceeds the diameter of the shank to a far lesser extent, in the order of 5 to 10 percent
  • the pitch of the present screw is much greater
  • the thread pitch in the present screw has a major crest-to-crest interval at least as large as the diameter of the shank 10 of the screw Applicant believes that a thread pitch of less than the shank diameter, when threads as disclosed herein are used, results in excessive undercutting of the borehole walls, with resulting reduction in pull-out resistance
  • the screw of the present invention also includes a plurality of helical grooves, having a rotation of opposite hand to the rotation of the helical threads
  • a total of three counter-helical grooves 17 are illustrated
  • Grooves 17 are generally V-shaped, having a narrow apex angle of 30° or less
  • the grooves may be symmetrical (as illustrated in Fig 2), or asymmetrical in the direction of the screw rotation
  • the grooves extend completely through the full height of both the major thread 15 and the minor thread 16, and penetrate into the shank 10
  • the groove has a depth into the shank 10 which exceeds the height of the minor thread, whereby the screw diameter at the base of the groove is in the order of 5 to 10 percent less than the diameter of shank 10
  • the grooves 17 have a pitch of at least twice the opposite pitch of the threads In the screw illustrated in Fig 1 , the pitch of the groove forms an angle ⁇ in the order of 30° with the axis of the screw In comparison, the pitch may be
  • a limited number of threads such as the first two or three convolutions, depending on the pitch, and preferably at least 25 mm of threads, are cut not only by the counter-helical groove 17, but by an additional rotationally adjacent groove 18 which, in combination with groove 17, forms a W-shaped cut-out
  • An asymmetrical W cut-out of combined groove 17 and 18 is shown in Fig 3, and provides a saw tooth aspect to the leading few convolutions of major and minor threads 15 and 16 This saw effect aids in the initial scarifying or cutting of a thread into the surface walls of the borehole into which the screw is driven
  • a further embodiment of the present screw is illustrated
  • the screw has a set of counter helical grooves of much steeper pitch, having an angle ⁇ of about 10° with the axis of the screw
  • a second set of grooves 19 is provided intermediate the previously described set of grooves
  • Those grooves, also of a V-shape, may extend over a limited portion from the tip end of the screw
  • the three shorter intermediate grooves 19 may be provided for approximately 1/3 of the threaded length of the screw and are preferably at least 25 mm in length
  • Grooves 19 may also have an asymmetrical V-shape, inclined in the direction of rotation of the screw
  • intermediate grooves 19 can be positioned adjacent the major grooves 17 to effect a W-shaped combination
  • the screw In operation, the screw is positioned in a borehole having a diameter slightly larger than the diameter of shank portion 10 and head end portion 12
  • an appropriate interface such as a Phillips, Robertson or Torques pattern driver hole or wrench flats
  • rotational forces are applied to head 13 of the screw to rotate the screw into the hole
  • the lead threads and cut-outs created by grooves 17 and 18 (19) carve an initial thread pattern, which is followed by major thread 15 and minor thread 16 Major thread 15 cuts significant thread tracks in the wall and provides the greatest resistance against putlout Minor thread 16 penetrates the sidewall to a lesser extent, and provides a solid second bearing for the body of the screw, but without significant cutting or weakening of the wall
  • the screw of the present invention does not retain the abraded concrete powder in the vicinity of the tip of the screw, but rather the series of helical groove allows the concrete powder to disperse along the length of the screw, and to the extent necessary, to fill in the grooves 17 (and 18, 19)
  • This dispersion of concrete powder avoids the increased resistance at the tip of the screw, thereby permitting full transmission of torque throughout the screw length, and full penetration to the design depth, with vastly improved shear resistance and pullout resistance
  • the screw has a length of 92 mm, a threaded length of 60 mm, a shank diameter of 5 7 mm, a major thread crest diameter of 7 5 mm, and a minor thread crest diameter of 5 85 mm, and a thread pitch of 5 7 mm
  • the screw also had three counter-helical grooves, having a groove depth of 5 25 mm and a groove pitch of 30 mm (about 30°)
  • Asymmetrical W shaped cut-outs are provided on the first three convolutions (initial 25 mm) of the major and minor threads
  • the screw has the same length, shank and thread diameters and thread pitch
  • the pitch of the counter helical groove is about 120 mm
  • the screw driving torque required for the screw of the present invention was only 60 percent of that of prior art screws while pull
  • the screw as described above exhibits greater pull-out resistance, decreased torque requirements and consequently greatly reduced failure from shearing of the screw during installation This significantly speeds installation, as it avoids re-drilling of pilot boreholes for installation of a replacement screw, and possibly total replacement of the anchor system involved

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Connection Of Plates (AREA)
  • Transmission Devices (AREA)

Abstract

La vis pour béton décrite par l’invention réduit le couple moteur nécessaire, les ruptures par cisaillement et améliore la résistance à l’arrachage. Cette vis présente deux filetages différents, le diamètre du filetage principal étant plus grand que le diamètre du filetage secondaire, les filetages ayant un écart de pas au moins égal au diamètre de la tige de vis. Des sillons hélicoïdaux à sens de rotation opposé par rapport aux filetages se prolongent sur la longueur de la partie filetée de la vis et présentent un écart de pas d’au moins deux fois le diamètre de la tige de vis. Des sillons de contre-rotation hélicoïdaux intermédiaires sont présents sur une partie limitée adjacente au bout de la vis et couvrent en général tout au plus le tiers de la longueur des filets. Les sillons intermédiaires peuvent être adjacents aux sillons principaux pour réaliser une encoche en forme de W dans les filets. L’encoche en forme de W est, de préférence, asymétrique dans le sens de rotation des sillons.
EP06741570A 2005-06-16 2006-05-29 Vis à utiliser dans le béton Withdrawn EP1891340A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002510200A CA2510200A1 (fr) 2005-06-16 2005-06-16 Vis pour utilisation dans le beton
US11/161,425 US20060285940A1 (en) 2005-06-16 2005-08-02 Screw For Use In Concrete
PCT/CA2006/000861 WO2006133542A1 (fr) 2005-06-16 2006-05-29 Vis à utiliser dans le béton

Publications (1)

Publication Number Publication Date
EP1891340A1 true EP1891340A1 (fr) 2008-02-27

Family

ID=37531909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06741570A Withdrawn EP1891340A1 (fr) 2005-06-16 2006-05-29 Vis à utiliser dans le béton

Country Status (2)

Country Link
EP (1) EP1891340A1 (fr)
WO (1) WO2006133542A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041877A1 (de) * 2009-09-07 2011-03-10 Swg Schraubenwerk Gaisbach Gmbh Betonschraube
TWI815149B (zh) * 2021-07-21 2023-09-11 趙穎慶 螺絲

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US877131A (en) 1906-11-20 1908-01-21 Walter C Jordan Screw.
US1235626A (en) 1917-02-28 1917-08-07 Charles Daniel Woodward Screw.
US3937119A (en) 1974-12-23 1976-02-10 Illinois Tool Works, Inc. Masonry anchor device
US4842467A (en) 1984-08-24 1989-06-27 Yamashina Seiko-Sho, Ltd. Concrete screw
US4697969A (en) 1985-09-06 1987-10-06 Sparkes Wilford S Wood screw
US5061136A (en) 1990-10-03 1991-10-29 Emhart Inc. Masonry screw anchor
US5759003A (en) * 1996-07-22 1998-06-02 Greenway; John Michael Combined screw and clearance drill
GB9715779D0 (en) * 1997-07-26 1997-10-01 Unifix Ltd Improved fixing anchor
AUPQ919200A0 (en) * 2000-08-04 2000-08-24 Hanstock Fasteners Pty Limited Improvements relating to screws for concrete and masonry
US6789991B2 (en) * 2002-04-23 2004-09-14 Kuo-Tai Hsu Screw
US6872042B2 (en) * 2003-05-08 2005-03-29 Illinois Tool Works Inc. Knurled fastener with cutting edges and removable head

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006133542A1 *

Also Published As

Publication number Publication date
WO2006133542A1 (fr) 2006-12-21
WO2006133542A8 (fr) 2008-01-17

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